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JP4561416B2 - Electric tool - Google Patents

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Publication number
JP4561416B2
JP4561416B2 JP2005071687A JP2005071687A JP4561416B2 JP 4561416 B2 JP4561416 B2 JP 4561416B2 JP 2005071687 A JP2005071687 A JP 2005071687A JP 2005071687 A JP2005071687 A JP 2005071687A JP 4561416 B2 JP4561416 B2 JP 4561416B2
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battery
secondary battery
terminal
temperature
motor
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JP2006247821A (en
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博 宮崎
敏治 大橋
正昭 阪上
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Panasonic Corp
Panasonic Electric Works Co Ltd
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Panasonic Corp
Matsushita Electric Works Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)

Description

本発明は、電動工具、殊に二次電池を電源として動作する電動工具に関するものである。   The present invention relates to a power tool, and more particularly to a power tool that operates using a secondary battery as a power source.

二次電池を電源とする機器においては、二次電池の過放電を防止するために電池電圧を検出して過放電となる時はモータ等の負荷を停止させることが行われている（例えば、特許文献１参照）。   In a device using a secondary battery as a power source, in order to prevent overdischarge of the secondary battery, when the battery voltage is detected and overdischarge occurs, the load of the motor or the like is stopped (for example, Patent Document 1).

また、二次電池がリチウムイオン電池である場合、その充電制御のために二次電池の温度を測定する温度センサを設けている。   When the secondary battery is a lithium ion battery, a temperature sensor for measuring the temperature of the secondary battery is provided for charge control.

ところで、二次電池を電源とする電動工具では、放電電流が大電流となる場合が多く、このために二次電池は充電時に温度上昇するだけでなく、放電時にも温度上昇し、この熱が二次電池セルの劣化を招くことがある。
特開平１０−２７６３０号公報 By the way, in a power tool using a secondary battery as a power source, the discharge current often becomes a large current, and for this reason, the secondary battery not only rises in temperature during charging but also rises in temperature during discharging, and this heat The secondary battery cell may be deteriorated.
JP-A-10-27630

本発明は上記の従来の問題点に鑑みて発明したものであって、その目的とするところは放電時の熱影響による二次電池セルの劣化を防いで長期にわたる使用を可能とする電動工具を提供することを課題とするものである。   The present invention has been invented in view of the above-described conventional problems, and an object of the present invention is to provide an electric tool that can be used for a long period of time by preventing deterioration of a secondary battery cell due to a thermal effect during discharge. The issue is to provide.

上記課題を解決するために本発明に係る電動工具は、二次電池を電源として作動するモータを備えた電動工具において、上記二次電池を工具本体に対して着脱自在な電池パックとし、上記電池パックが電源端子と温度用端子と二次電池種別識別用端子と電池電圧測定手段とを備えるとともに、工具本体が上記各端子に対応する接続端子を備えており、上記モータの駆動制御を行う制御回路は、上記二次電池の温度を検出する温度センサの出力及び上記電池電圧測定手段から得られる電池電圧に応じてモータ出力を制限させるとともに、二次電池種別識別用端子を通じて得られる二次電池種別データに応じて、上記温度用端子を通じて得られる温度データに対応する制御及び上記電池電圧測定手段から得られる電池電圧に応じた制御を変更し、二次電池種別識別用端子を通じて識別された二次電池が低温時に内部抵抗増加が大きく且つ電圧降下が大となる電池である場合、上記制御回路は上記モータ出力を制限させる電池電圧の閾値を低い値に変更するものであることに特徴を有している。電池パックの二次電池の種別を識別して、モータの出力を制限させるべき温度を電池の種類に応じて切り換えることができ、且つ放電時にも電池セルの温度が高くなれば、モータ出力を制限するようにしたものである。 In order to solve the above problems, an electric tool according to the present invention is an electric tool including a motor that operates with a secondary battery as a power source, wherein the secondary battery is a battery pack that is detachable from a tool body, and the battery The pack includes a power supply terminal, a temperature terminal, a secondary battery type identification terminal, and a battery voltage measuring means, and the tool body includes a connection terminal corresponding to each of the terminals, and performs control for driving the motor. The circuit limits the motor output according to the output of the temperature sensor for detecting the temperature of the secondary battery and the battery voltage obtained from the battery voltage measuring means , and the secondary battery obtained through the secondary battery type identification terminal depending on the type data, and change the control according to the control and the battery voltage obtained from the battery voltage measuring unit corresponding to the temperature data obtained through the temperature terminal, When the secondary battery identified through the secondary battery type identification terminal is a battery having a large internal resistance increase and a large voltage drop at a low temperature, the control circuit sets a low battery voltage threshold value for limiting the motor output. It is characterized in der Rukoto those changes. By identifying the type of secondary battery in the battery pack, the temperature at which the motor output should be restricted can be switched according to the type of battery, and if the battery cell temperature rises even during discharge, the motor output is restricted. It is what you do.

本発明は、放電時に電池セルの温度が高くなると二次電池の種別に応じた温度でモータ出力を制限するために、電池セルが放電時に高温に晒されることがなく、熱による電池セルの劣化を防いで二次電池セルの長期にわたる使用を可能とし、更に電池残容量が大であるにもかかわらず低温時にはすぐに使えなくなってしまうという事態の発生を防ぐことができる。 The present invention limits the motor output at a temperature corresponding to the type of the secondary battery when the temperature of the battery cell becomes high at the time of discharge, so that the battery cell is not exposed to a high temperature at the time of discharge, and the battery cell is deteriorated by heat The secondary battery cell can be used for a long period of time, and even when the remaining battery capacity is large, it is possible to prevent the occurrence of a situation where the secondary battery cell cannot be used immediately at low temperatures.

以下、本発明を添付図面に示す実施形態に基いて説明すると、図２は本発明に係る電動工具を示しており、回転出力部１０を駆動するモータＭを内蔵した工具本体１と、この工具本体１のグリップ部下端に形成された電池パック装着部１９に着脱自在に装着される電池パック２とで構成されており、工具本体１側にはトリガーハンドルの操作でオンオフされるトリガースイッチ１２やモータＭの回転を制御する制御回路１５のほか、電池パック２との接続用の電源端子１３や接続端子１５，１６，１７を備えている。   Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings. FIG. 2 shows an electric tool according to the present invention, a tool body 1 incorporating a motor M for driving a rotation output unit 10, and the tool. The battery pack 2 is detachably attached to the battery pack attachment portion 19 formed at the lower end of the grip portion of the main body 1, and the trigger switch 12 that is turned on and off by the operation of the trigger handle on the tool main body 1 side In addition to the control circuit 15 for controlling the rotation of the motor M, a power supply terminal 13 for connection with the battery pack 2 and connection terminals 15, 16 and 17 are provided.

上記トリガースイッチ１２は、図１に示すようにトリガーハンドル１１の引き操作量に応じて抵抗値を変化させる可変抵抗器１２をスピードコントロール用に備えたものであり、電池パック２が装着された状態でトリガーハンドル１１を引けば、制御回路１５はこの引き量に応じた回転速度でのモータＭの駆動をスイッチング素子３３を介して行うとともに、トリガーハンドル１１をいっぱいに引き込めば、モータＭをフル回転速度で駆動し、さらにトリガーハンドル１１を戻してトリガースイッチ１２をオフとした時には、モータＭの電圧入力端子間を短絡することでモータＭに制動を加えるものとなっている。図中３０は定電圧源、３５はトリガースイッチ１２と連動してオンオフする給電スイッチ３６を備えた給電スイッチ部である。   As shown in FIG. 1, the trigger switch 12 includes a variable resistor 12 for changing the resistance value according to the pulling operation amount of the trigger handle 11 for speed control, and the battery pack 2 is mounted. When the trigger handle 11 is pulled, the control circuit 15 drives the motor M at the rotational speed corresponding to the pull amount via the switching element 33, and when the trigger handle 11 is fully pulled, the motor M is full. When driving at a rotational speed and further returning the trigger handle 11 to turn off the trigger switch 12, the motor M is braked by short-circuiting the voltage input terminals of the motor M. In the figure, reference numeral 30 denotes a constant voltage source, and 35 denotes a power supply switch section including a power supply switch 36 that is turned on and off in conjunction with the trigger switch 12.

一方、複数の二次電池セル２０を内蔵している電池パック２は、上記電池パック装着部１９に装着された時、電源端子１３に接続される電源端子２３と、接続端子１５，１６，１７に夫々接続される接続端子２５，２６，２７を備えている。また、図１に示すように電池パック２はその内部に上記接続端子２３に接続された過放電検出回路２１と、接続端子２６に接続された温度センサ２２と、接続端子２７に接続された識別用抵抗２８とを備えている。   On the other hand, when the battery pack 2 including the plurality of secondary battery cells 20 is attached to the battery pack attachment portion 19, the power supply terminal 23 connected to the power supply terminal 13 and the connection terminals 15, 16, and 17 are connected. Are provided with connection terminals 25, 26, and 27, respectively. Further, as shown in FIG. 1, the battery pack 2 includes an overdischarge detection circuit 21 connected to the connection terminal 23, a temperature sensor 22 connected to the connection terminal 26, and an identification connected to the connection terminal 27. Resistance 28.

そして、工具本体１における制御回路１５は、電池パック２が工具本体１に接続されてトリガースイッチ１２をオンとする時、上記給電スイッチ部３５をと定電圧源３４を通じてまず給電され、その後、トリガースイッチ１２の引き操作量に応じてモータＭの制御駆動を行うのであるが、このモータＭの駆動時に電池パック２側の過放電検出回路２１から検出される二次電池セル２０の過放電検出信号を受けた時、モータＭを停止させて二次電池セル２０を保護する。   Then, when the battery pack 2 is connected to the tool body 1 and the trigger switch 12 is turned on, the control circuit 15 in the tool body 1 is first supplied with power through the power supply switch unit 35 and the constant voltage source 34, and then triggered. The motor M is controlled and driven according to the pulling operation amount of the switch 12, and the overdischarge detection signal of the secondary battery cell 20 detected from the overdischarge detection circuit 21 on the battery pack 2 side when the motor M is driven. When receiving, the motor M is stopped and the secondary battery cell 20 is protected.

また、温度センサ２２にて検出される二次電池セル２０の温度が制御回路１５内のＲＯＭに書き込まれている所定値を越えたならば、制御回路１５はモータＭを停止させるのではなく、モータＭの出力を制限することで放電電流値を抑えるものである。また、温度に応じて出力の制限を行うものであってもよい。二次電池セル２０が高温となっている状態での放電を抑制することで、二次電池セル２０の劣化を防ぐのである。なお、上記温度センサ２２は、充電時の過充電防止のためのものと共用することができる。 Further, the if exceeds a predetermined value the temperature of the the battery cells 20 detected by the temperature sensor 22 is written in the ROM of the control circuit 15, control circuit 15 Ru stops the motors M rather, Ru der thereby suppressing a discharge current value by limiting the output of the motor M. Also, it may perform the limitation of the output depending on the temperature. By secondary battery cell 20 is suppressed discharge in a state in which a high temperature is to prevent deterioration of the secondary battery cell 20. The temperature sensor 22 can be used in common with the one for preventing overcharging during charging.

そして接続端子２７，１７を通じて制御回路１５に接続される識別用抵抗２８は、工具本体１に接続された電池パック２の種別を制御回路１５に伝達するためのものである。すなわち、この電動工具では電池パック２として二次電池セル２０がリチウムイオン電池であるものと、ニッケルメタルハイドライド電池であるものと、ニッケルカドミウム電池であるものとを使用することができるようになっており、上記識別用抵抗２８はこれらの電池の種類に応じて異なった抵抗値のものが用いられており、制御回路１５はどの電池を使用した電池パック２が接続されているのかを識別して、モータＭの出力を制限すべき温度を電池の種類に応じて切り換えるものとなっている。たとえば、リチウムイオン電池であれば、検出される二次電池セル２０の温度が６０〜７０℃になった時点で出力を抑制する。 The identification resistor 28 connected to the control circuit 15 through the connection terminals 27 and 17 is for transmitting the type of the battery pack 2 connected to the tool body 1 to the control circuit 15. Chi words, so that it can be used as the battery pack 2 as a secondary battery cell 20 is a lithium ion battery in the electric tool, as a nickel metal hydride battery, and those which are nickel-cadmium batteries The identification resistor 28 has a different resistance value depending on the type of the battery, and the control circuit 15 identifies which battery the battery pack 2 is connected to. And the temperature which should restrict | limit the output of the motor M is switched according to the kind of battery. For example, if a lithium ion battery, the temperature of the secondary battery cell 20 detected to suppress the output when it becomes 60 to 70 ° C..

また、このように電池種別の識別を行うことができるようにしたものでは、制御回路Ｃは各電池によって異なる特性に応じた駆動制御も可能となる。すなわち、工具本体１側あるいは電池パック２側に電池電圧測定手段（図示せず）を設けて、電池電圧が所定の閾値以下になればモータＭの出力を制限したり停止させたりするものが従来より提供されているが、このような制御を行うにあたり、電池の種別に応じて制御回路１５が上記閾値を変更することで、例えば低温時の内部抵抗増加が大きくて電圧降下が大であるニッケルメタルハイドライド電池が接続された場合、その閾値を低くすることで、電池残容量が大であるにもかかわらず低温時にはすぐに使えなくなってしまうという事態の発生を防ぐことができるものとなる。   In addition, in the case where the battery type can be identified in this way, the control circuit C can also perform drive control according to the characteristics that are different for each battery. That is, a battery voltage measuring means (not shown) is provided on the tool body 1 side or the battery pack 2 side, and the output of the motor M is limited or stopped when the battery voltage falls below a predetermined threshold value. In such a control, the control circuit 15 changes the threshold value according to the type of battery, for example, a nickel having a large internal resistance increase at a low temperature and a large voltage drop. When a metal hydride battery is connected, by lowering the threshold value, it is possible to prevent a situation in which the battery cannot be used immediately at a low temperature even though the remaining battery capacity is large.

図３に他例を示す。これは電池パック２側でモータＭの出力を制限すべき温度になったかどうかを判定してその判定結果のみを工具本体１側の制御回路１５に伝達するようにしたものである。この場合、温度センサ２２の出力と比較すべき判定レベルを電池パック２内で設定することになるために、電池の種類が異なる電池パック２を工具本体１に接続できるようにしている場合、識別用抵抗２８を持たないものであってもよい。なお、ここでは上記の電池による特性の差に応じた駆動制御のために識別用抵抗２８を電池パック２側に持たせている。 FIG. 3 shows another example. In this case, it is determined whether or not the temperature at which the output of the motor M should be limited is reached on the battery pack 2 side, and only the determination result is transmitted to the control circuit 15 on the tool body 1 side. In this case, since the determination level to be compared with the output of the temperature sensor 22 is set in the battery pack 2, when the battery pack 2 having a different battery type can be connected to the tool body 1, the identification is performed. It may be one without the resistance 28 for use. Here, an identification resistor 28 is provided on the battery pack 2 side for drive control in accordance with the difference in characteristics between the batteries.

図４に更に他例を示す。これは電池パック２側にマイクロコンピュータなどで構成されて上記過放電検出回路２１を含む制御回路２９を設けるとともに、該制御回路２９で温度センサ２２の出力を監視して、二次電池セル２０の温度が所定値を超えれば、制御回路２９がこの点を工具本体１側の制御回路１５に通信することで、モータＭの出力の制限を制御回路１５側で行わせるようにしたものであり、電池種別の識別も接続端子２４，１４を通じて制御回路２９が工具本体１側の制御回路１５に通信するようにしたものである。 FIG. 4 shows still another example. The battery pack 2 is provided with a control circuit 29 which is composed of a microcomputer or the like and includes the overdischarge detection circuit 21, and the control circuit 29 monitors the output of the temperature sensor 22 so that the secondary battery cell 20 If the temperature exceeds a predetermined value, the control circuit 29 communicates this point to the control circuit 15 on the tool body 1 side, thereby limiting the output of the motor M on the control circuit 15 side. The battery type is also identified by the control circuit 29 communicating with the control circuit 15 on the tool body 1 side through the connection terminals 24 and 14.

いずれにしても、二次電池セル２０の温度が上昇したことでモータＭの出力を制限する時、制御回路１５は工具本体１の外面に配した図１に示す表示部３０によってその旨を表示するものとしておくのが好ましい。使用者が故障と勘違いすることがなくなる。
In any case, when the output of the motor M is limited due to the rise in the temperature of the secondary battery cell 20, the control circuit 15 displays that fact by the display unit 30 shown in FIG. It is preferable to do so. The user will not be mistaken for a malfunction.

本発明の実施の形態の一例のブロック回路図である。It is a block circuit diagram of an example of an embodiment of the invention. 同上の分解図である。It is an exploded view same as the above. 他例のブロック回路図である。It is a block circuit diagram of another example. 更に他例のブロック回路図である。It is a block circuit diagram of another example.

符号の説明Explanation of symbols

Ｍ モータ
１ 工具本体
２ 電池パック
１５ 制御回路
２０ 二次電池セル
２２ 温度センサ M motor 1 tool body 2 battery pack 15 control circuit 20 secondary battery cell 22 temperature sensor

Claims (1)

二次電池を電源として作動するモータを備えた電動工具であって、上記二次電池を工具本体に対して着脱自在な電池パックとし、上記電池パックが電源端子と温度用端子と二次電池種別識別用端子と電池電圧測定手段とを備えるとともに、工具本体が上記各端子に対応する接続端子を備えており、上記モータの駆動制御を行う制御回路は、上記二次電池の温度を検出する温度センサの出力及び上記電池電圧測定手段から得られる電池電圧に応じてモータ出力を制限させるとともに、二次電池種別識別用端子を通じて得られる二次電池種別データに応じて、上記温度用端子を通じて得られる温度データに対応する制御及び上記電池電圧測定手段から得られる電池電圧に応じた制御を変更し、二次電池種別識別用端子を通じて識別された二次電池が低温時に内部抵抗増加が大きく且つ電圧降下が大となる電池である場合、上記制御回路は上記モータ出力を制限させる電池電圧の閾値を低い値に変更するものであることを特徴とする電動工具。 A power tool including a motor that operates using a secondary battery as a power source, wherein the secondary battery is a detachable battery pack with respect to the tool body, and the battery pack includes a power terminal, a temperature terminal, and a secondary battery type. In addition to the terminal for identification and the battery voltage measuring means , the tool body includes a connection terminal corresponding to each terminal, and the control circuit for controlling the driving of the motor detects the temperature of the secondary battery. The motor output is limited according to the output of the sensor and the battery voltage obtained from the battery voltage measuring means, and obtained through the temperature terminal according to the secondary battery type data obtained through the secondary battery type identification terminal. change the control according to the control and the battery voltage obtained from the battery voltage measuring unit corresponding to the temperature data, the secondary battery which is identified through the secondary battery type identification terminal When the internal resistance increases at a low temperature is large and voltage drop a battery as a large power tool the control circuit, characterized in der Rukoto which changes the threshold value of the battery voltage for limiting the motor output to a low value .
JP2005071687A 2005-03-14 2005-03-14 Electric tool Expired - Fee Related JP4561416B2 (en)

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JP4561416B2 true JP4561416B2 (en) 2010-10-13

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